Definition

To make a solemn promise or oath, or to emphatically assert something is true. Can be used as a verb meaning to declare something under oath or as an emphatic statement of truthfulness.

Example Usage

I swear I didn't eat the last slice of pizza—check the kitchen camera!

Origin

From Old English and Germanic roots, dating back centuries; the emphatic usage became standardized in legal and everyday contexts

Fun Fact

In legal contexts, 'swearing in' someone means administering an oath, while casually 'swearing' often requires no formal setting

Source: Definition backfill (hailey)